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MIDP 3.0 addresses the long pending capability of external libraries. If you have developed Desktop and Server applications you should have used external libraries in the form of JAR files. You can just put these libraries in the CLASSPATH and start using these libraries by importing their packages. And these libraries need not be packaged with your application.

This same capability is now added to MIDP 3.0 and these libraries are called LIBlets. These LIBlets will not have a life cycle and application entry point like in case of MIDlet and will execute in the MIDlet’s execution process. Each LIBlet will be a separate JAR and JAD files. Important features of a LIBlet are

• JAD file is mandatory for a LIBlet unlike the MIDlets where JAD file is optional
  
• Each JAR file should have only one LIBlet
  
• Any number of MIDlets can access one LIBlet
  
• One LIBlet can make a call to one or more LIBlets
  
• LIBlets can be configured in their JAD files to be accessible to only to few specific LIBlets and MIDlets.

A LIBlet JAR file has following components

• Manifest File
  
• Java Classes
  
• Resource files like text files, images, audio, vedio etc.
  
• Persistent object called RMS Interchange Format which is new to MIDP 3.0 and will be discussed in later section of this tutorial
  

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